Fluid fuel burner



P. A. CELAN DER FLUID FUEL BURNER Sept. 22, 193

Filed Jur 1e 28, 1934 2 Shets-Sheet l ATTOI NEY.

Spt. 22, 1936.

P. A. C-ELANDER FLUID FUEL BURNER Filed June 28, 1934 2 Sheets-Sheet 2 1 N V EN TOR. Y PH/L /P /7. C54 /7/V0/? A TTOR, JEY

Patented Sept. 22, 1936 I iFU iWRN R 7 Philip AQCelander, Bloomington; Illl, .assignor to .Williams OiI-O-Matic .Heating Corporation, 'l sloomington, 111., a corporation of lllinois ApplicationJune 2 8, 1934 ,Se'rial No." 732,"767

' 12 Claims. (crass-515)".

1 This invention relates to-improvements in fluid fuel-burners for cooking ranges andmore'particularly'to a control for regulating the heat produced by the burner in accordance with the temperature'required within therange. v

With'these andother objects in view, reference is made to the accompanying sheets of drawings which illustratepreferred forms of this invention. i 1 Figure 1 isa view in perspective illustrating an application of this invention to a cooking-range, with parts broken away and parts indicated in section. i i I Figure 2is an enlarged detail view, partly in front elevation, with parts broken away nac ntracted, and parts in vertical section. Figure 3 is a view similar to Figure 2 illustratinga modified form of'this invention.

I Figure 4 is a view similar to Figure 3, illustrating another form of this invention. 5 'Figure 5 is a fragmentary view, "partly in end elevation, of Figure 2, and partly in section.

Fig'ure dis a diagrammatical wiring diagram illustrating a modification of this invention to operate automatically.

Figure 1 illustrates a cooking range I such as employed in hotels, restaurants, hospitals, schools, and the like, including a cooking top composed of flat plates 2 and-ovens 3. A commercialfluid fuel burner 4 is shown mounted upon the left hand end of the range I preferably of the type illustrated in the patent to -Walter W. Williams, No. 1,976,317, dated October 9, 1934, 'Which includes a motor 5 operating a fluid fuel pump-6 and a fan blower for directing a stream combustion chamber 8 of the range. I

' The particular type of fluid fuel burner disclosed :in said Williams patent is provided with means for regulating the supply of fluidffuel and for limiting the supply of air projected throughthe draft pipe I, which may be operated in unison to regulate the amount of heat produced or the size of the flame. This said patent I discloses a manual control" for these parts and this invention contemplates an automatic control to maintain an even temperature'below the top platesand in the ovens. r

As shown in the fragmentary view in Figure 5, the fuel'pump 6 is provided with acam 3 mounted on the rotatable shaft I ll which is adapted to control the flow of fuel from the pump; and the draftpip'e I is provided with a butterfly valve or-draftregulator I I mounted upon the rotatable shaft I2 adapted to control the flow of air therethrough The face of the pump 6 is provided with a casing I3 into which the fluid fuel regulating shaft Ill passes from the pump. The casing I3 mounts below the shaft I and in parallel relation thereto an actuating shaft I4 which is conriectedthrough' the crank I and links I6 with the 'operatingshaft I2 of the draft regulator II in the draft pipe I. The end of the shaft I0 within the casing I3 is provided with a depending arm"I 1"--connected thereto, and the end of the shaft I4 within the casing I3 is provided with 8. depending arm I8 extending upwardly therefrom and overlapping the arm II. Thearm I8 is provide'd with a slot I9 and the arm H is provided witha' stud adapted to be engaged within and travel over said slot I9. The depending'po'rtion of the arml tl diametrically opposite the slot I9 is provided with a gearZI concentric to the centerof theshaft I4.- Mounted within the casing below the arms I I and I8 is a segment 22 mounted oii'a'pi-vot 23 in alignment with the centers of the shafts Iti and I4 andhaving a segment gear 24 meshingwith the teethof the gear 2|. The

parts are s'o proportioned'tliat a rotation of the segment '22 in one direction imparts a rotation totliefactuating shaft Iflto open the draft regulator l I the maximum capacity for the draft pipe landthroughthestud and slot connection with thearm-II to rotate' 'the cam fl to incre'ase' the capacity of the fluidfuel pump to maximum. Rotationof'the segment 22 in the opposite direction reverses-the operation of the shafts Illand I4 to reduce the fluid fuel and air supplyto a minimum. Y

' This invention contemplates the imparting of an authrnatic movement to the segment 22 actuatedby the. temperature within the range. In th'e iorrnshown in Figures 1 and'2, an operating link 25 is shown connected to thesegment '22 abovethe pivot thereof with-its other and extending-into atube 26 arranged parallel thereto and extendi ng from one end of the range to the other through the combustion chamber 8 and 'ovens "3. It 'is preferable 'to providea bar- 21 mounted' withinthe tube connected at one end variations of its' temperature so that when the oven is col'd 'th'e bar 27 will be contracted imparting a rotationto the segment 22 to actuate the shafts IU an'd'l l to provide 'a maximum supply. 'of fluid fuel and air to the combustion chamber. When the'fluid fuel burner 4 is set in operaticn and the fuel ignited; the temperature within" the combustion chamber and ovens will gradually increase, whereupon the bar 21 will'be caused to'expand'torotate'the' segment 22 to gradually. reduce thesupply o'ffuel and air to thecombustionchamber andrtherebyreduce the temperature within the range and will maintain an even temperature within the range irrespective of the opening and closing of the oven doors Figure 3 illustrates a modified form of this invention in which the link is extended through a tube 26 which passes only through the combustion chamber 8, and the end of the link 25 opposite'the segment 22 is provided with a sliding connection 29 to engage the free end of a U-shaped bi-metallic thermal member 30 having its opposite end secured to the wall of the oven 3 opposite the tube 26%. The thermal member 30 is so constructed that when the range is cold, the free end will be contracted, as shown in the dotted lines, to rotate the segment 22 to provide a maximum supply of fuel and air to the burner 4. As the temperature within the oven increases, the free end of the thermal member 30 will expand, causing the lever 26 to move in the oppositedirectionto cut down the supply of fuel and; air to the burner in the same manner as described in Figure 2.

Figure 4 illustrates a still further modification. In this type the casing I3 is extendedto form a chamber 3| preferably supported against the adjacent endof the range I and mounts an expansible and contractible metallic bellows 32 with the reciprocating closed end thereof adjacent the casing l3 and provided with a link 25 having one end attached tothe segment 22 and the other to the reciprocable end of the bellows. The other end of the bellows is closed and communicates with thepipe 3 3 v preferably passing through a tube ZG mounted within the combustion chamber 8 which tube extends therebeyond and through the adjacent oven 3 and communicates with a bulb-or closed flask 33* mounted on the wall :of the I oven 3 opposite the combustion chamber. This bulb or flask is filled with readily expansible and contractible gas or liquid, such as acetone, which is readily responsive to temperature changes so that when the range is cold the liquid will contract and allow the bellows 32 to contract to rotate the segment 22 to the maximum'amount of fuel and fluid to the fluid fuel burner 4. .When burner mechanism is started, the heat therefrom will cause the fluid within the bulb 33 to expand, causing the bellows to expand, toimpart a rotation to the segment 22 in the opposite direction in the same manner as described in connection with the controls illustrated in Figures 2 and 3.

In the controls above described, it is necessary to manually start and stop the fuel-burning mechanism or to provide some independent means for starting theburner motor and igniting the flame. The control will operate as long as the burner mechanism is operating-to vary the supply ofair and fuel from the maximum to the minimum, without a shutdown, in accordance, with the demands of the range.

1 ,This invention also contemplates an automatic starting and. stopping, of the fuel-burning mechanism, as shown in the wiring diagram illustrated in Figure 6. In this'type, a switch, preferably a mercury tube switch, 34 is mounted 'upon the segment 22, which is connected in series with the motor M of the fluid fuel-burning mechanism, so thatwhen the link 25 has been extended to the limit of its movement, after reducing the supply of fuel and air to a minimum,

will causethe switch 34 to open the motor circuit. -A hand switch H is provided in the motor circuit and .a' transformer T is connected in parallel with the motor circuit, which transformer provides an ignition circuit when the hand switch H is closed to a continuously operating spark gap S adapted to ignite the fluid fuel. To initiate the operation of the fluid fuel burner when the range is cold, it is only necessary to close the hand switch H as the retraction of the link 25 by the expansible and contractible rod 21 shown in Figure 2, or the contraction of the bi-metallic member 30 shown in Figure 3, or by the retraction of the bellows 32 shown in Figure 4, has oscillated the segment 22 to operate the parts controlled thereby to supply the maximum fuel and air, and has also closed the mercury switch 34. The closing of the hand switch H immediately energizes the ignition device S and starts the operation of the motor to supply fuel and air to the burner mechanism, which is at once'ignited by the spark gap S. Thereafter, the operation of the control and fluid fuel burner will be continuous until the motor circuit is manually opened: In the event that the temperature within the range becomes greater than desired with the minimum supply of fuel and air, the mercury switch 34 will open the circuit to the motor, the fuel-burning mechanism will become idle and will remain so until the range calls for more heat, as the links 25, 25 or 25", as the case may be, are retracted and the mercury switch 34 again closed.

What I claim is: 1 1

1. In a fluid fuel burning cooking range including an oven, a combustion chamber at one end having. a passage for the hot gases-of combustion over said oven, a fluid fuel burning mechanism mounted upon the exterior ofsaid combustion chamber at one end of the range, means for regulating the supply of fuel within the burner mechanism having an exteriorly projecting operating shaft, means for regulating the supply of air within the burner mechanism having an exteriorly projecting operating shaft ex tending in parallel relation to the first shaft,'a housing attached to the burner mechanism mounting the free ends of said operating shafts, the ends of said operating shafts within the housing mounting arms to overlap each other provided with a pin and slot connection whereby rotation of one arm imparts a. rotation to the other, one of, said arms having a portion in the form of a gear concentric with its respective operating shaft, a segment gear meshing therewith mounted within said housing on a pivot in line with said operating shafts, an operating link connected at one end to said segment between its pivot and the adjacent operating shaft and having its other end extending within the adjacent wall of the combustion chamber, and pivotally to one end of a contractible and expansible member mounted therein and responsive to temperature changes within said oven. j; 2. The structure of claim 1, wherein the fuel burning mechanism is electrically operated and an electric switch connected in series with the burner motor is mounted upon saidsegmentso that after the operating link actuated by the expansion of its attached member has reduced the supply of fuel and air to a minimum, further movement will open said switch and render said burner inoperative. I

PHILIP A. CELANDER. 

